#help-overlay {
  position: absolute;
  width: 0;
  height: 0;
  top: 0;
  left: 0;
  cursor: default;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  -webkit-transition: opacity 200ms;
  -moz-transition: opacity 200ms;
  -o-transition: opacity 200ms;
  transition: opacity 200ms;
}
#help-overlay.opened {
  opacity: 1;
}
#help-overlay.visible {
  visibility: visible;
}